The acidic proteins, A-proteins, from the large ribosomal subunit of Saccharomyces cerevisiae grown under different conditions have been quantitatively estimated by ELISA tests using rabbit sera specific for these polypeptides. It has been found that the amount of A-protein present in the ribosome is not constant and depends on the metabolic state of the cell. Ribosomes from exponentially growing cultures have about 40% more of these proteins than those from stationary phase. Similarly, the particles forming part of the polysomes are enriched in A-proteins as compared with the free 80 S ribosomes. The cytoplasmic pool of A-protein is considerably high, containing as a whole as much protein as the total ribosome population. These results are compatible with an exchanging process of the acidic proteins during protein synthesis that can regulate the activity of the ribosome. On the other hand, cells inhibited with different metabolic inhibitors produce a very low yield of ribosomes that contain, however, a surprisingly high amount of acidic proteins while the cytoplasmic pool is considerably reduced, suggesting that under stress conditions the ribosome and the A-protein may aggregate, forming complex structures that are not recovered by the standard preparation methods.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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